More locking for syscons(4). This should prevent races with sckbdevent().
More locking for syscons(4). This should prevent races with sckbdevent().

PR:		kern/127446
Submitted by:	Eygene Ryabinkin rea-fbsd at codelabs dot ru

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase